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+/** PreviewPlugin.cc file for the fluxbox compositor. */
+
+// Copyright (c) 2011 Gediminas Liktaras (gliktaras at gmail dot com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#include "PreviewPlugin.hh"
+
+#include "BaseScreen.hh"
+#include "Exceptions.hh"
+#include "Utility.hh"
+#include "XRenderScreen.hh"
+#include "XRenderWindow.hh"
+
+#include <algorithm>
+#include <iostream>
+
+using namespace FbCompositor;
+
+
+//--- CONSTANTS ----------------------------------------------------------------
+
+/** Maximum height of the preview window. */
+const int MAX_PREVIEW_HEIGHT = 150;
+
+/** Maximum width of the preview window. */
+const int MAX_PREVIEW_WIDTH = 150;
+
+/** Transparency of the preview window. */
+const unsigned int PREVIEW_ALPHA = 200;
+
+/** Time in microseconds until the preview window is shown. */
+const int SLEEP_TIME = 500000;
+
+
+//--- CONSTRUCTORS AND DESTRUCTORS ---------------------------------------------
+
+// Constructor.
+PreviewPlugin::PreviewPlugin(const BaseScreen &screen, const std::vector<FbTk::FbString> &args) :
+    XRenderPlugin(screen, args) {
+
+    unsigned long mask_color = 0x01010101 * PREVIEW_ALPHA;
+    Pixmap mask_pixmap = createSolidPixmap(screen, MAX_PREVIEW_WIDTH, MAX_PREVIEW_HEIGHT, mask_color);
+    XRenderPictFormat *pict_format = XRenderFindStandardFormat(display(), PictStandardARGB32);
+    m_mask_picture = new XRenderPicture(xrenderScreen(), pict_format, FilterFast);
+    m_mask_picture->setPixmap(mask_pixmap, true);
+
+    m_previous_damage.width = 0;
+    m_previous_damage.height = 0;
+    m_previous_window = None;
+
+    m_tick_tracker.setTickSize(SLEEP_TIME);
+}
+
+// Destructor.
+PreviewPlugin::~PreviewPlugin() { }
+
+
+
+//--- WINDOW EVENT CALLBACKS ---------------------------------------------------
+
+// Called, whenever a new window is created.
+void PreviewPlugin::windowCreated(const BaseCompWindow &window) {
+    const XRenderWindow &xr_window = dynamic_cast<const XRenderWindow&>(window);
+
+    XRenderPictFormat *pict_format = XRenderFindStandardFormat(display(), PictStandardARGB32);
+    XRenderPicturePtr thumbnail(new XRenderPicture(xrenderScreen(), pict_format, FilterBest));
+
+    Pixmap thumb_pixmap = createSolidPixmap(screen(), MAX_PREVIEW_WIDTH, MAX_PREVIEW_HEIGHT);
+    thumbnail->setPixmap(thumb_pixmap, true);
+
+    XRenderRenderingJob job = { PictOpOver, thumbnail, m_mask_picture, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+    PreviewWindowData win_data = { xr_window, job };
+    m_preview_data.insert(std::make_pair(xr_window.window(), win_data));
+}
+
+/** Called, whenever a window is destroyed. */
+void PreviewPlugin::windowDestroyed(const BaseCompWindow &window) {
+    std::map<Window, PreviewWindowData>::iterator it = m_preview_data.find(window.window());
+    if (it != m_preview_data.end()) {
+        m_preview_data.erase(it);
+    }
+}
+
+
+//--- RENDERING ACTIONS --------------------------------------------------------
+
+/** Rectangles that the plugin wishes to damage. */
+const std::vector<XRectangle> &PreviewPlugin::damagedAreas() {
+    m_damaged_areas.clear();
+
+    if ((m_previous_damage.width > 0) && (m_previous_damage.height > 0)) {
+        m_damaged_areas.push_back(m_previous_damage);
+    }
+
+    std::map<Window, PreviewWindowData>::iterator it = m_preview_data.find(screen().currentIconbarItem());
+    if (it != m_preview_data.end()) {
+        Window cur_window = it->first;
+        PreviewWindowData &cur_preview = it->second;
+
+        if ((m_previous_window != cur_window)
+                && (cur_preview.window.contentPicture()->pictureHandle())
+                && (cur_preview.window.maskPicture()->pictureHandle())) {
+            m_previous_window = cur_window;
+            updatePreviewWindowData(cur_preview);
+        }
+
+        updatePreviewWindowPos(cur_preview);
+
+        XRectangle cur_damage = { cur_preview.job.destination_x, cur_preview.job.destination_y,
+                                  cur_preview.job.width, cur_preview.job.height };
+        m_damaged_areas.push_back(cur_damage);
+        m_previous_damage = cur_damage;
+
+        if (!m_tick_tracker.isRunning()) {
+            m_tick_tracker.start();
+        }
+    } else {
+        m_previous_damage.width = 0;
+        m_previous_damage.height = 0;
+        m_previous_window = None;
+        m_tick_tracker.stop();
+    }
+
+    return m_damaged_areas;
+}
+
+/** Extra rendering actions and jobs. */
+const std::vector<XRenderRenderingJob> &PreviewPlugin::extraRenderingActions() {
+    m_extra_jobs.clear();
+
+    std::map<Window, PreviewWindowData>::iterator it = m_preview_data.find(xrenderScreen().currentIconbarItem());
+    if (it != m_preview_data.end()) {
+        PreviewWindowData &cur_preview = it->second;
+
+        if ((cur_preview.job.source_picture->pictureHandle()) && (m_tick_tracker.totalElapsedTicks() > 0)) {
+            m_extra_jobs.push_back(cur_preview.job);
+        }
+    }
+
+    return m_extra_jobs;
+}
+
+
+//--- INTERNAL FUNCTIONS -------------------------------------------------------
+
+// Update the preview window data.
+void PreviewPlugin::updatePreviewWindowData(PreviewWindowData &win_preview) {
+    double scale_factor = 1.0;
+    scale_factor = std::max(scale_factor, win_preview.window.realWidth() / double(MAX_PREVIEW_WIDTH));
+    scale_factor = std::max(scale_factor, win_preview.window.realHeight() / double(MAX_PREVIEW_HEIGHT));
+
+    int thumbWidth = static_cast<int>(win_preview.window.realWidth() / scale_factor);
+    int thumbHeight = static_cast<int>(win_preview.window.realHeight() / scale_factor);
+
+    win_preview.window.contentPicture()->scalePicture(scale_factor, scale_factor);
+    win_preview.window.maskPicture()->scalePicture(scale_factor, scale_factor);
+
+    XRenderComposite(display(), PictOpSrc,
+                     win_preview.window.contentPicture()->pictureHandle(), 
+                     win_preview.window.maskPicture()->pictureHandle(),
+                     win_preview.job.source_picture->pictureHandle(),
+                     0, 0, 0, 0, 0, 0, thumbWidth, thumbHeight);
+
+    win_preview.window.contentPicture()->resetPictureTransform();
+    win_preview.window.maskPicture()->resetPictureTransform();
+
+    win_preview.job.width = thumbWidth;
+    win_preview.job.height = thumbHeight;
+}
+
+// Update the preview window position.
+// TODO: Place the preview window on the edge of the toolbar.
+// TODO: Left/Right toolbar orientations.
+void PreviewPlugin::updatePreviewWindowPos(PreviewWindowData &win_preview) {
+    int mouse_pos_x, mouse_pos_y;
+    mousePointerLocation(screen(), mouse_pos_x, mouse_pos_y);
+
+    if (screen().heads().size() > 0) {
+        XRectangle cur_head = screen().heads()[0];
+
+        for (size_t i = 1; i < screen().heads().size(); i++) {
+            XRectangle head = screen().heads()[i];
+            if ((mouse_pos_x >= head.x) && (mouse_pos_y >= head.y)
+                    && (mouse_pos_x < (head.x + head.width))
+                    && (mouse_pos_y < (head.y + head.height))) {
+                cur_head = head;
+                break;
+            }
+        }
+
+        win_preview.job.destination_x = mouse_pos_x - (win_preview.job.width / 2);
+
+        int mid_head = cur_head.y + (cur_head.height / 2);
+        if (mouse_pos_y < mid_head) {
+            win_preview.job.destination_y = mouse_pos_y + 10;
+        } else {
+            win_preview.job.destination_y = mouse_pos_y - win_preview.job.height - 10;
+        }
+    } else {    // But what IF.
+        win_preview.job.destination_x = mouse_pos_x - (win_preview.job.width / 2);
+        win_preview.job.destination_y = mouse_pos_y + 10;
+    }
+}
+
+
+//--- PLUGIN MANAGER FUNCTIONS -------------------------------------------------
+
+// Creates a plugin object.
+extern "C" BasePlugin *createPlugin(const BaseScreen &screen, const std::vector<FbTk::FbString> &args) {
+    return new PreviewPlugin(screen, args);
+}
+
+// Returns the type of the plugin.
+extern "C" FbCompositor::PluginType pluginType() {
+    return Plugin_XRender;
+}